/* =========================================================
   WEBLAB · 01. BASE Y VARIABLES
   ========================================================= */
:root {
  --ink: #18213a;
  --muted: #59657c;
  --line: #e1e6f0;
  --blue: #233de0;
  --soft: #f5f7fc;
  --html: #b74619;
  --css: #233de0;
  --js: #795300;
  --header-height: 80px;
}
* {
  box-sizing: border-box;
}
[hidden] {
  display: none !important;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}
body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font:
    1rem/1.7 Manrope,
    system-ui,
    sans-serif;
}
h1,
h2,
h3,
h4,
.brand {
  font-family: "Space Grotesk", system-ui, sans-serif;
  line-height: 1.15;
  letter-spacing: -0.025em;
}
h1 {
  font-size: clamp(2.7rem, 5vw, 4.8rem);
  margin: 0 0 24px;
}
h2 {
  font-size: clamp(1.9rem, 3vw, 2.8rem);
  margin: 0 0 18px;
}
h3 {
  font-size: 1.35rem;
  margin: 0 0 14px;
}
p {
  margin: 0 0 18px;
}
a {
  color: inherit;
  text-underline-offset: 4px;
}
button,
input,
select,
textarea {
  font: inherit;
}
button {
  cursor: pointer;
}
button:disabled {
  cursor: default;
  opacity: 0.5;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible {
  outline: 3px solid #3255ff;
  outline-offset: 4px;
}
svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}
code,
pre,
textarea {
  font-family: "JetBrains Mono", monospace;
}
code {
  font-size: 0.875em;
}
p code,
dd code {
  color: #243abb;
  background: #eef1ff;
  border-radius: 4px;
  padding: 2px 5px;
  overflow-wrap: anywhere;
}
pre {
  background: #192238;
  color: #e3e9fa;
  border-radius: 14px;
  padding: 22px;
  overflow: auto;
  line-height: 1.75;
  font-size: 0.875rem;
  max-width: 100%;
}
.container {
  width: min(1160px, calc(100% - 48px));
  margin: auto;
}
.section {
  padding-top: 64px;
  padding-bottom: 64px;
}
.section-head {
  margin-bottom: 32px;
  max-width: 800px;
}
.section-head > p:not(.eyebrow) {
  color: var(--muted);
}
.eyebrow {
  color: var(--blue);
  font-size: 0.75rem;
  letter-spacing: 0.13em;
  font-weight: 800;
  margin-bottom: 18px;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 12px 20px;
  font-weight: 800;
  min-height: 48px;
  text-decoration: none;
}
.primary {
  background: var(--blue);
  color: white;
}
.primary:hover {
  background: #172aac;
}
.secondary {
  background: white;
  color: var(--ink);
  border-color: var(--line);
}
.secondary:hover {
  background: var(--soft);
}
.text-link {
  font-weight: 800;
}
.skip-link {
  position: fixed;
  top: -80px;
  left: 20px;
  z-index: 100;
  background: white;
  padding: 12px;
}
.skip-link:focus {
  top: 12px;
}
.note {
  color: var(--muted);
  font-size: 0.875rem;
  margin-top: 20px;
}

/* 02. NAVEGACIÓN Y FOOTER */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #fffffffa;
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  width: min(1160px, calc(100% - 48px));
  margin: auto;
  min-height: 80px;
  display: flex;
  align-items: center;
  gap: 40px;
}
.brand {
  display: inline-flex;
  align-items: center;
  font-size: 1.7rem;
  font-weight: 700;
  text-decoration: none;
  gap: 10px;
  white-space: nowrap;
}
.brand svg {
  width: 30px;
  height: 30px;
  color: var(--blue);
}
.brand span {
  color: var(--blue);
  margin-left: -10px;
}
#main-nav {
  display: flex;
  gap: 28px;
  margin-left: auto;
}
#main-nav a {
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 800;
  padding: 10px 0;
}
#main-nav a[aria-current],
#main-nav a:hover {
  color: var(--blue);
}
.nav-practice {
  color: var(--blue);
  background: #eef1ff;
  border-radius: 9px;
  font-size: 0.875rem;
  padding: 8px 16px;
  font-weight: 800;
  text-decoration: none;
}
.menu-button {
  display: none;
}
.site-footer {
  border-top: 1px solid var(--line);
  padding: 50px max(24px, calc((100% - 1160px) / 2));
  background: var(--soft);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 50px;
}
.footer-grid h2 {
  font-size: 1.1rem;
}
.footer-grid p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 18px;
}
.footer-grid nav > a,
.footer-grid section > a:not(.brand) {
  display: block;
  font-size: 0.9rem;
  margin: 9px 0;
  text-decoration: none;
}
.footer-grid a:hover {
  color: var(--blue);
}
.footer-note {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

/* 03. PORTADA Y RECORRIDO */
.home-hero {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 70px 0 65px;
}
.home-hero > * {
  min-width: 0;
}
.home-hero h1 {
  overflow-wrap: anywhere;
}
.home-hero h1 span {
  color: var(--blue);
}
.hero-description {
  color: var(--muted);
  font-size: 1.15rem;
  max-width: 550px;
}
.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 22px;
  margin: 30px 0 22px;
}
.hero-meta {
  font-size: 0.8rem;
  color: var(--muted);
}
.browser-demo {
  margin: 0;
  border: 1px solid #d7dff2;
  border-radius: 20px;
  box-shadow: 0 18px 45px #22366b0b;
  overflow: hidden;
  transform: rotate(-2deg);
}
.browser-demo figcaption {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 13px 20px;
  background: #f0f3fa;
  font-size: 0.75rem;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}
.browser-dots {
  letter-spacing: 4px;
  color: #9ba8c3;
}
.demo-screen {
  padding: 38px 32px;
  min-height: 280px;
  background: linear-gradient(130deg, #f4f6ff, #fff);
}
.demo-label {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--blue);
  letter-spacing: 0.15em;
}
.demo-screen h2 {
  font-size: 2.8rem;
  margin-top: 24px;
}
.demo-screen p {
  font-size: 0.9rem;
  color: var(--muted);
}
.demo-screen button {
  border: 0;
  color: white;
  background: var(--blue);
  padding: 12px 17px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 800;
}
.code-layers {
  list-style: none;
  padding: 15px 22px;
  margin: 0;
  background: #192238;
  color: #e3e9fa;
}
.code-layers li {
  display: flex;
  gap: 15px;
  align-items: center;
  padding: 8px 0;
  font-size: 0.8rem;
}
.code-layers span {
  color: #adb9ff;
  width: 40px;
  font-weight: 800;
}
.code-layers code {
  overflow-wrap: anywhere;
}
.course-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.course-card {
  border: 1px solid var(--line);
  padding: 30px;
  border-radius: 20px;
  position: relative;
}
.chapter-number {
  position: absolute;
  top: 25px;
  right: 25px;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 800;
}
.course-symbol {
  display: grid;
  place-items: center;
  width: 68px;
  height: 68px;
  border-radius: 14px;
  font: 700 1.6rem "JetBrains Mono";
  margin-bottom: 26px;
}
.html-course .course-symbol {
  background: #fff0e6;
  color: var(--html);
}
.css-course .course-symbol {
  background: #edf0ff;
  color: var(--css);
}
.js-course .course-symbol {
  background: #fff4cd;
  color: var(--js);
}
.course-card h3 {
  font-size: 2rem;
}
.course-card p,
.course-card li {
  color: var(--muted);
  font-size: 0.9rem;
}
.course-card ul {
  padding-left: 18px;
  margin-bottom: 26px;
}
.course-card a {
  font-weight: 800;
}
.study-method {
  background: #f3f5fd;
}
.method-grid {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.method-grid > li > span {
  font: 500 1rem "JetBrains Mono";
  color: var(--blue);
}
.method-grid h3 {
  margin-top: 16px;
}
.method-grid p {
  color: var(--muted);
}
.faq details,
.explanation {
  border-bottom: 1px solid var(--line);
  padding: 20px 0;
}
summary {
  cursor: pointer;
  font-weight: 800;
}
.faq p,
.explanation dl {
  margin-top: 18px;
}

/* 04. PÁGINAS DE ESTUDIO */
.lesson-hero {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--line);
}
.lesson-hero h1 {
  max-width: 1000px;
}
.lesson-hero > .container > p:not(.eyebrow) {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.1rem;
}
.html-theme {
  background: #fff6ef;
}
.html-theme .eyebrow {
  color: var(--html);
}
.css-theme {
  background: #f0f3ff;
}
.js-theme {
  background: #fff9e5;
}
.js-theme .eyebrow {
  color: var(--js);
}
.chapter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-top: 30px;
  font-size: 0.9rem;
  font-weight: 800;
}
.two-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: start;
  gap: 42px;
}
.two-columns > * {
  min-width: 0;
}
.two-columns article > h3:not(:first-child) {
  margin-top: 30px;
}
.two-columns p,
.two-columns li {
  color: var(--muted);
}
.definition-list {
  display: grid;
  grid-template-columns: minmax(100px, auto) 1fr;
  gap: 10px 20px;
}
.definition-list dt {
  font-weight: 800;
}
.definition-list dd {
  margin: 0;
  color: var(--muted);
}
.callout {
  border-left: 4px solid var(--blue);
  padding: 24px 28px;
  background: var(--soft);
  border-radius: 0 14px 14px 0;
  margin-top: 30px;
}
.callout p:last-child {
  margin: 0;
}
.callout code {
  overflow-wrap: anywhere;
}
.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  list-style: none;
  padding: 0;
}
.timeline li {
  border-top: 3px solid var(--line);
  padding-top: 22px;
}
.timeline-date {
  color: var(--blue);
  font: 500 1rem "JetBrains Mono";
}
.timeline h3 {
  font-size: 1.15rem;
  margin-top: 18px;
}
.timeline p {
  color: var(--muted);
  font-size: 0.9rem;
}

/* 05. REFERENCIA: EL CONTENIDO PERMANECE EN HTML */
.reference-search {
  display: grid;
  grid-template-columns: 1.5fr 1fr auto;
  gap: 10px 16px;
  padding: 22px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 16px;
}
.reference-search label:first-of-type {
  grid-column: 1;
  grid-row: 1;
}
.reference-search label:last-of-type {
  grid-column: 2;
  grid-row: 1;
}
.reference-search input {
  grid-column: 1;
  grid-row: 2;
}
.reference-search select {
  grid-column: 2;
  grid-row: 2;
}
.reference-search button {
  grid-column: 3;
  grid-row: 2;
}
input[type="search"],
select {
  width: 100%;
  min-width: 0;
  padding: 12px 14px;
  border: 1px solid #d9dfeb;
  border-radius: 9px;
  background: white;
  color: var(--ink);
}
label {
  font-size: 0.875rem;
  font-weight: 700;
}
.reference-status {
  color: var(--muted);
  font-size: 0.875rem;
  margin: 20px 0;
}
.reference-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-items: start;
}
.reference-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  min-width: 0;
}
.reference-card summary {
  padding: 18px 20px;
}
.reference-card summary code {
  font-size: 0.95rem;
  color: var(--blue);
}
.reference-card summary > span {
  font-size: 0.75rem;
  font-weight: 500;
  display: block;
  color: var(--muted);
  margin: 6px 0 0 17px;
}
.reference-content {
  padding: 0 22px 22px;
  font-size: 0.95rem;
}
.reference-content dl {
  margin: 20px 0;
}
.reference-content dt {
  font-weight: 800;
  margin-top: 14px;
}
.reference-content dd {
  margin: 4px 0 0;
  color: var(--muted);
}
.reference-content a {
  font-size: 0.85rem;
  font-weight: 800;
}
.reference-content pre {
  padding: 16px;
  font-size: 0.8rem;
}

/* 06. LABORATORIOS Y REPASO */
.playground {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
}
.editor {
  padding: 25px;
  background: #f4f6fb;
  border-right: 1px solid var(--line);
}
.editor label {
  display: block;
  margin: 18px 0 7px;
}
.editor textarea {
  width: 100%;
  resize: vertical;
  min-height: 140px;
  padding: 14px;
  border: 1px solid #d2d9e7;
  border-radius: 10px;
  background: #fff;
  font-size: 0.8rem;
  line-height: 1.65;
  color: #23314e;
  tab-size: 2;
}
.editor textarea[data-code="js"] {
  min-height: 210px;
}
.editor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}
.preview {
  padding: 24px;
  min-width: 0;
}
.preview header {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
  margin-bottom: 20px;
}
.preview h3 {
  font-size: 1.15rem;
}
.live-label {
  color: var(--muted);
  font-size: 0.75rem;
}
.preview iframe {
  width: 100%;
  height: 430px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: white;
}
.preview h4 {
  margin: 22px 0 10px;
}
.lab-console {
  white-space: pre-wrap;
  min-height: 70px;
  font-size: 0.8rem;
  max-height: 250px;
}
.control-panel {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--soft);
}
fieldset {
  border: 0;
  padding: 0;
  margin: 0;
}
legend {
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 20px;
}
.control-panel label {
  display: flex;
  justify-content: space-between;
  margin: 20px 0 9px;
}
.control-panel input[type="range"] {
  width: 100%;
  accent-color: var(--blue);
}
.control-panel input[type="color"] {
  width: 100%;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.control-panel button {
  margin-top: 24px;
}
#box-demo {
  padding: 24px;
  border: 2px solid #233de0;
  border-radius: 16px;
  background: #e9eeff;
}
#box-demo h3 {
  font-size: 1.2rem;
}
#grid-demo {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 25px;
}
#grid-demo span {
  display: grid;
  place-items: center;
  min-height: 55px;
  border-radius: 8px;
  color: var(--blue);
  background: #edf0ff;
  font-weight: 800;
}
.counter-demo {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 30px;
  background: #fff9e5;
}
.counter-demo output {
  display: block;
  font: 600 5rem "Space Grotesk";
  color: var(--blue);
  margin: 24px 0;
}
.counter-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.counter-demo p {
  margin: 20px 0 0;
  font-size: 0.9rem;
}
.quiz {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  background: var(--soft);
}
.quiz label {
  display: block;
  padding: 12px;
  margin-bottom: 9px;
  border: 1px solid var(--line);
  background: white;
  border-radius: 10px;
}
.quiz input {
  accent-color: var(--blue);
  margin-right: 8px;
}
.quiz button {
  margin-top: 15px;
}
.quiz-result {
  margin: 20px 0 0;
  font-weight: 600;
}
.quiz-result.correct {
  color: #216b41;
}

/* 07. ADAPTACIÓN Y ACCESIBILIDAD */
@media (max-width: 1000px) {
  .home-hero {
    gap: 30px;
  }
  .nav-inner {
    gap: 20px;
  }
  .timeline {
    grid-template-columns: repeat(2, 1fr);
  }
  .course-card {
    padding: 24px;
  }
  .footer-grid {
    gap: 30px;
  }
}
@media (max-width: 750px) {
  .container,
  .nav-inner {
    width: calc(100% - 32px);
  }
  .nav-inner {
    min-height: 72px;
    display: grid;
    grid-template-columns: 1fr auto;
    padding: 12px 0;
  }
  .menu-button {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    background: white;
    border: 1px solid var(--line);
    border-radius: 9px;
  }
  #main-nav {
    display: none;
    grid-column: 1/-1;
    width: 100%;
    margin: 0;
    padding-top: 12px;
    gap: 8px;
  }
  #main-nav.is-open {
    display: grid;
  }
  #main-nav a {
    padding: 10px;
  }
  .nav-practice {
    display: none;
  }
  .home-hero,
  .two-columns,
  .playground {
    grid-template-columns: 1fr;
  }
  .home-hero {
    padding: 42px 0;
    gap: 38px;
  }
  .browser-demo {
    transform: none;
  }
  .course-grid,
  .method-grid {
    grid-template-columns: 1fr;
  }
  .course-card ul {
    margin-bottom: 18px;
  }
  .section {
    padding-top: 42px;
    padding-bottom: 42px;
  }
  .lesson-hero {
    padding-top: 38px;
  }
  .reference-grid {
    grid-template-columns: 1fr;
  }
  .reference-search {
    grid-template-columns: 1fr auto;
  }
  .reference-search label:last-of-type {
    grid-column: 1;
    grid-row: 3;
  }
  .reference-search select {
    grid-column: 1;
    grid-row: 4;
  }
  .reference-search input {
    grid-column: 1/-1;
  }
  .reference-search button {
    grid-column: 2;
    grid-row: 4;
  }
  .editor {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 20px;
  }
  .preview {
    padding: 20px;
  }
  .preview iframe {
    height: 330px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-grid > section:first-child {
    grid-column: 1/-1;
  }
}
@media (max-width: 400px) {
  .timeline,
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .reference-search {
    grid-template-columns: 1fr;
  }
  .reference-search button {
    grid-column: 1;
    grid-row: 5;
  }
  .definition-list {
    grid-template-columns: 1fr;
  }
  .definition-list dd {
    margin-bottom: 10px;
  }
  .demo-screen {
    padding: 26px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}